Magnetic response and electronic states of well defined Graphene/Fe/Ir(111) heterostructure
arXiv:2101.05674 · doi:10.1103/PhysRevMaterials.5.014405
Abstract
We investigate a well defined heterostructure constituted by magnetic Fe layers sandwiched between graphene (Gr) and Ir(111). The challenging task to avoid Fe-C solubility and Fe-Ir intermixing has been achieved with atomic controlled Fe intercalation at moderate temperature below 500 K. Upon intercalation of a single ordered Fe layer in registry with the Ir substrate, an intermixing of the Gr bands and Fe d states breaks the symmetry of the Dirac cone, with a downshift in energy of the apex by about 3 eV, and well-localized Fe intermixed states induced in the energy region just below the Fermi level. First principles electronic structure calculations show a large spin splitting of the Fe states, resulting in a majority spin channel almost fully occupied and strongly hybridized with Gr π states. X-ray magnetic circular dichroism on the Gr/Fe/Ir heterostructure reveals an ordered spin configuration with a ferromagnetic response of Fe layer(s), with enhanced spin and orbital configurations with respect to the bcc-Fe bulk values. The magnetization switches from a perpendicular easy magnetization axis when the Fe single layer is lattice matched with the Ir(111) surface to a parallel one when the Fe thin film is almost commensurate with graphene.
References in corpus (8)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Advanced capabilities for materials modelling with Quantum ESPRESSO
- Graphene Spintronics
- Dirac Cones and Minigaps for Graphene on Ir(111)
- Graphene on Ir(111) characterized by angle-resolved photoemission
- Graphene growth and properties on metal substrates
- Europium Underneath Graphene on Ir(111): Intercalation Mechanism, Magnetism, and Band Structure
- Electronic structure of Graphene/Co interfaces